If you are disheartened, you feel disappointed about something and have less confidence or less hope about it than you did before. He was disheartened by their hostile reaction. = discouraged. disappointed, so that you lose hope and the determination to continue doing something
made less hopeful or enthusiastic; "desperate demoralized people looking for work"; "felt discouraged by the magnitude of the problem"; "the disheartened instructor tried vainly to arouse their interest"
If something is disheartening, it makes you feel disappointed and less confident or less hopeful. making you lose hope and determination it is disheartening to hear/see etc sth